<script lang="ts" setup>
import { Background, Handle, Position, VueFlow, useVueFlow } from '@braks/vue-flow'
import { breakpointsTailwind, useBreakpoints } from '@vueuse/core'
import confetti from 'canvas-confetti'
import colors from 'windicss/colors'
import { cheer, fireworks } from './confetti'
import Heart from '~icons/mdi/heart'

const breakpoints = useBreakpoints(breakpointsTailwind)

const dark = ref(false)

onMounted(() => {
  const html = document.getElementsByTagName('html')![0]

  const observer = new MutationObserver((mutations) => {
    for (const m of mutations) {
      dark.value = html.classList.contains('dark')
    }
  })

  observer.observe(html, {
    attributes: true,
    attributeOldValue: true,
    attributeFilter: ['class'],
  })
})

const initialEdges = [
  {
    id: 'eintro-examples',
    type: 'smoothstep',
    sourceHandle: 'a',
    source: 'intro',
    target: 'examples',
    animated: true,
    style: { strokeWidth: 4, stroke: '#ef467e' },
  },
  {
    id: 'eintro-documentation',
    type: 'smoothstep',
    sourceHandle: 'a',
    source: 'intro',
    target: 'documentation',
    animated: true,
    style: { strokeWidth: 4, stroke: '#f97316' },
  },
  {
    id: 'eintro-acknowledgement',
    type: 'smoothstep',
    sourceHandle: 'a',
    source: 'intro',
    target: 'acknowledgement',
    animated: true,
    style: { strokeWidth: 4, stroke: '#0ea5e9' },
  },
]
const { dimensions, onNodeClick, getNodes, fitView, getNode, getEdge, updateEdge, edges, setEdges } = useVueFlow({
  nodes: [
    { id: 'intro', type: 'box', position: { x: 0, y: 0 } },
    { id: 'examples', type: 'box', position: { x: -50, y: 400 } },
    { id: 'documentation', type: 'box', position: { x: 300, y: 400 } },
    { id: 'acknowledgement', type: 'box', position: { x: 150, y: 500 } },
  ],
  edges: initialEdges,
  elementsSelectable: true,
  nodesDraggable: false,
  panOnDrag: false,
  zoomOnScroll: false,
  zoomOnDoubleClick: false,
  zoomOnPinch: false,
})

const clickInterval = ref()
const clicks = ref(0)
const disabled = ref(false)

const confettiColors = Object.values(colors).flatMap((color) => {
  if (typeof color === 'string') return color
  else return Object.values(color).flatMap((c) => c)
})

onNodeClick(async ({ node }) => {
  if (node.id === 'intro') {
    if (disabled.value) return

    if (clickInterval.value) {
      clearInterval(clickInterval.value)
    }

    clickInterval.value = setInterval(() => {
      clearInterval(clickInterval.value)
      clicks.value = 0
    }, 1000)

    clicks.value++
    if (clicks.value < 10) {
      confetti({
        startVelocity: 25,
        spread: 360,
        angle: 270,
        origin: { y: 0.1 },
        colors: confettiColors,
      })
    } else if (clicks.value < 20) {
      await cheer(['#10b981', dark.value ? '#ffffff' : '#000000'])
    } else if (clicks.value === 20) {
      disabled.value = true
      await fireworks(confettiColors)
      disabled.value = false
    } else {
      clicks.value = 0
    }
  }
})

const el = templateRef<HTMLDivElement>('el', null)

const setNodes = () => {
  if (breakpoints.isSmaller('md')) {
    const mainNode = getNode.value('intro')!
    getNodes.value.forEach((node) => {
      switch (node.id) {
        case 'intro':
          node.position = { x: 0, y: 0 }
          break
        case 'examples':
          node.position = {
            x: mainNode.dimensions.width / 2 - node.dimensions.width / 2,
            y: mainNode.dimensions.height * 1.5,
          }
          break
        case 'documentation':
          node.position = {
            x: mainNode.dimensions.width / 2 - node.dimensions.width / 2,
            y: mainNode.dimensions.height * 2 + 50,
          }
          break
        case 'acknowledgement':
          node.position = {
            x: mainNode.dimensions.width / 2 - node.dimensions.width / 2,
            y: mainNode.dimensions.height * 3,
          }
          break
      }
    })

    setEdges(() => {
      return [
        {
          id: 'eintro-examples',
          type: 'smoothstep',
          sourceHandle: 'a',
          source: 'intro',
          target: 'examples',
          animated: true,
          style: { strokeWidth: 4, stroke: '#ef467e' },
        },
        {
          id: 'eexamples-documentation',
          type: 'smoothstep',
          source: 'examples',
          target: 'documentation',
          animated: true,
          style: { strokeWidth: 4, stroke: '#f97316' },
        },
        {
          id: 'edocumentation-acknowledgement',
          type: 'smoothstep',
          source: 'documentation',
          target: 'acknowledgement',
          animated: true,
          style: { strokeWidth: 4, stroke: '#0ea5e9' },
        },
      ]
    })
  } else {
    getNodes.value.forEach((node) => {
      const mainNode = getNode.value('intro')!
      switch (node.id) {
        case 'intro':
          node.position = { x: 0, y: 0 }
          break
        case 'examples':
          node.position = { x: -node.dimensions.width / 2, y: mainNode.dimensions.height * 1.5 }
          break
        case 'documentation':
          node.position = {
            x: mainNode.dimensions.width - node.dimensions.width / 2,
            y: mainNode.dimensions.height * 1.5,
          }
          break
        case 'acknowledgement':
          node.position = {
            x: mainNode.dimensions.width / 2 - node.dimensions.width / 2,
            y: mainNode.dimensions.height * 2,
          }
          break
      }
    })

    setEdges(initialEdges)
  }

  nextTick(() => {
    fitView()
  })
}

const { stop } = useResizeObserver(el, useDebounceFn(setNodes, 5))
onBeforeUnmount(stop)

const scrollTo = () => {
  const el = document.getElementById('acknowledgement')
  if (el) {
    el.scrollIntoView({ behavior: 'smooth' })
  }
}
</script>

<template>
  <VueFlow ref="el" class="dark:bg-black bg-white transition-colors duration-200 ease-in-out">
    <Background variant="lines" :pattern-color="dark ? '#ffffff' : '#000000'" :size="0.7" :gap="100" />

    <template #node-box="props">
      <template v-if="props.id === 'intro'">
        <div class="box max-w-[500px]">
          <div class="intro px-4 py-2 shadow-lg rounded-md border-2 border-solid border-black">
            <div class="font-mono flex flex-col gap-4 p-4 items-center text-center">
              <h1 class="text-2xl lg:text-4xl">Vue Flow</h1>
              <h2 class="text-lg lg:text-xl font-normal !border-0">
                The customizable Vue 3 component bringing interactivity to flowcharts and graphs.
              </h2>
            </div>
            <Handle id="a" type="source" :position="Position.Bottom" />
          </div>
        </div>
      </template>
      <template v-else-if="props.id === 'documentation'">
        <div class="flex">
          <router-link class="link group bg-[#f15a16]" to="/guide/"> Read The Documentation </router-link>
        </div>
        <Handle type="target" :position="Position.Top" />
        <Handle class="block md:hidden" type="source" :position="Position.Bottom" />
      </template>
      <template v-else-if="props.id === 'examples'">
        <div class="flex">
          <router-link class="link group bg-[#ef467e]" to="/examples/"> Check The Examples </router-link>
        </div>
        <Handle type="target" :position="Position.Top" />
        <Handle class="block md:hidden" type="source" :position="Position.Bottom" />
      </template>
      <template v-else-if="props.id === 'acknowledgement'">
        <div class="flex" @click="scrollTo">
          <button class="link group bg-sky-500"><Heart class="text-red-500" /> Acknowledgement</button>
        </div>
        <Handle type="target" :position="Position.Top" />
      </template>
    </template>
  </VueFlow>
</template>

<style>
.intro {
  @apply cursor-pointer
  bg-green-500
  text-white
  transform
  transition-transform
  duration-300
  hover:(scale-105 ring ring-white);
}

.link {
  @apply flex
  gap-3
  items-center
  p-4
  shadow-lg
  transform
  transition-transform
  duration-300
  hover:(scale-102)
  transition-colors
  ease-in-out
  rounded-lg
  text-white
  font-semibold
  text-lg;
}
</style>
